/Engine/Source/Runtime/Engine/Classes/PhysicsEngine/BodyInstance.h
Sets a custom slope override struct for this instance. Implicitly sets bOverrideWalkableSlopeOnInstance to true.
void SetWalkableSlopeOverride ( const [FWalkableSlopeOverride](API\Runtime\Engine\Engine\FWalkableSlopeOverride) & NewOverride, bool bNewOverideSetting )